Consignment settlement

Hi Gurus,

can anybody please clarify the following for me.

IN MRKO, which is the consignment and pipeline settlement, what vendor should we enter to bring out the material documetns, i'm guessing it is the vendor number on whom the PO was originally cut right? If there is no alternative payee maintained in the vendor master of the main vendor, then whom does the payment go to? Does it go to to main vendor? I think we should never enter the PI vendor number in MRKO, because we will not get any material documents, do we?

Thanks

Anusha